85099840 has 56 divisors (see below), whose sum is σ = 231599232. Its totient is φ = 29176320.

The previous prime is 85099789. The next prime is 85099853. The reversal of 85099840 is 4899058.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16756 + ... + 21235.

Almost surely, 2^85099840 is an apocalyptic number.

85099840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85099840 is an abundant number, since it is smaller than the sum of its proper divisors (146499392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85099840 is a wasteful number, since it uses less digits than its factorization.

85099840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38015 (or 38005 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 85099840 is about 9224.9574524764. The cubic root of 85099840 is about 439.8550486720.

The spelling of 85099840 in words is "eighty-five million, ninety-nine thousand, eight hundred forty".